Abstract
The investigation of Oxide Inclusions removal in aluminium scrap casting process with sodium based fluxes has been carried out. The purpose of this research is to investigate the effect of Na2SO4 and NaCl based fluxes addition onto the fluidity and microstructure of aluminium product. The alloy which is used in this investigation is Al-Si which mixed with metal scrap using gravity casting method. The variation of melting temperature in this investigation are 700°C, 740°C, and 780°C. In this research, material characterization was determined using DSC, EDAX, XRD, and fluidity test. The results show that the number of oxide inclusions decrease as the addition of 0,2% wt. flux, and completly removed after the addition of 0,4% wt. flux. The highest fluidity and tensile strength was obtained after the addition of 0,4% wt. flux. at 740°C.
Highlights
Aluminium alloys is widely applied in many industrial product, such as transportation, packaging, construction, or houseware product due to its excellent properties, such as light weight, high corrosion resistance, high castability, and good conductor [1]-[4]
Inclusion can cause the presence of defect which can reduce the quality of the final product [10]-[12]
The number of oxide inclusions were reduced as the melting temperature increased and when the flux was used on molten aluminium
Summary
Aluminium alloys is widely applied in many industrial product, such as transportation, packaging, construction, or houseware product due to its excellent properties, such as light weight, high corrosion resistance, high castability, and good conductor [1]-[4]. Secondary aluminium is widely used in transportation, building, and packaging industries. The utilization of aluminium scrap in the aluminium recycling process has a disadvantage as it contains many impurities element that is not desired in metal casting [7]-[9]. These impurities are considered as unwanted inclusions can reduce the quality of the final product. Inclusion can cause the presence of defect which can reduce the quality of the final product [10]-[12]
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